import java.util.Scanner;

class AntBook {
	int page;

	void setPage(int ver) {
		this.page = 316 + (ver - 1) * 52;
	}
}

public class No_299 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		AntBook ab = new AntBook();
		ab.setPage(sc.nextInt());

		System.out.println(ab.page);
		sc.close();

	}

}